Carrier LGX180S Installation Instructions Manual
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Carrier LGX180S Installation Instructions Manual

Carrier LGX180S Installation Instructions Manual

Rooftop packaged units r-454b
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©2024
WARNING
Improper installation, adjustment, alteration, ser vice
or maintenance can cause property damage, personal
injury or loss of life. Installation and ser vice must be
performed by a licensed professional HVAC installer or
equivalent, service agency, or the gas supplier.

Table of Contents

Unit Dimensions . . . . . . . . . . . . . . . . . . . . . . 4
Parts Arrangement . . . . . . . . . . . . . . . . . . . . 7
Shipping and Packing List . . . . . . . . . . . . . . . . 8
General . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Requirements . . . . . . . . . . . . . . . . . . . . . . . 8
Unit Support . . . . . . . . . . . . . . . . . . . . . . . 10
Duct Connection . . . . . . . . . . . . . . . . . . . . 11
Rigging for Lifting . . . . . . . . . . . . . . . . . . . . 11
Condensate Drains . . . . . . . . . . . . . . . . . . . 11
Connect Gas Piping . . . . . . . . . . . . . . . . . . . 12
Pressure Test Gas Piping . . . . . . . . . . . . . . . 13
High Altitude Derate . . . . . . . . . . . . . . . . . . 13
Mobile Service App . . . . . . . . . . . . . . . . . . . 16
Multi-Stage Air Volume Start-Up . . . . . . . . . . . . 19
RETAIN THESE INSTRUCTIONS FOR FUTURE REFERENCE
INSTALLATION
INSTRUCTIONS
LGX/LCX180S
LGX/LCX210S
LGX/LCX240S
LGX/LCX300S
ROOFTOP PACKAGED UNITS
508515-01
7/2024
Blower Operation and Adjustments . . . . . . . . . . 21
Refrigerant Leak Detection System . . . . . . . . . . 27
Cooling Start-Up . . . . . . . . . . . . . . . . . . . . . 27
Prognostic Sensors . . . . . . . . . . . . . . . . . . . 41
RDS Sensors . . . . . . . . . . . . . . . . . . . . . . . 44
Gas Heat Start-Up (Gas Units) . . . . . . . . . . . . . 45
Electric Heat Start-Up (LCX Units) . . . . . . . . . . . 47
Preventative Maintenance / Repair . . . . . . . . . . 50
Decommissioning . . . . . . . . . . . . . . . . . . . . 58
(15 Ton)
(17.5 Ton)
(20 Ton)
(25 Ton)
R-454B

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Summary of Contents for Carrier LGX180S

  • Page 1: Table Of Contents

    INSTALLATION INSTRUCTIONS ©2024 WARNING LGX/LCX180S (15 Ton) Improper installation, adjustment, alteration, ser vice or maintenance can cause property damage, personal LGX/LCX210S (17.5 Ton) injury or loss of life. Installation and ser vice must be LGX/LCX240S performed by a licensed professional HVAC installer or (20 Ton) equivalent, service agency, or the gas supplier.
  • Page 2 CAUTION WARNING As with any mechanical equipment, contact with sharp •This appliance must be installed in accordance with sheet metal edges can result in personal in jury. Take local and national wiring regulations. care while handling this equipment and wear gloves and •If the appliance is not fitted with an option for full protective clothing.
  • Page 3 A2L Refrigerant Considerations When breaking into the refrigerant circuit to make repairs – or for any other purpose – conventional procedures shall Ensure that the work area is adequately ventilated before be used. However, for flammable refrigerants it is important breaking into the system or conducting any hot work.

  • Page 4: Top View

    WARNING To prevent serious injury or death: 1- Lock-out. tag-out before performing maintenance. 2- If system power is required (e.g., smoke detector maintenance), disable power to blower, remove fan belt where applicable, and ensure all control- lers and thermostats are set to the OFF position before performing maintenance.

  • Page 5: Unit Dimensions

    LGX/LCX240S Unit Dimensions - Inches (mm) - Gas Heat Section Shown 132-5/8 (3369) 4-1/4 (108) 12-3/8 60-1/2 (1537) (314) 15 (381) BOTTOM RETURN 28-3/8 AIR OPENING (721) BOTTOM SUPPLY AIR OPENINGS 18 (457) ALTERNATE (THRU THE BASE) CONDENSATE DRAIN LOCATION 4-1/2 91-1/8 5-5/8 (143)
  • Page 6 LGX/LCX300S Unit Dimensions - Inches (mm) - Gas Heat Section Shown 132-5/8 (3369) 4-1/4 (108) 12-3/8 60-1/2 (1537) (314) 15 (381) BOTTOM RETURN 28-3/8 AIR OPENING (721) BOTTOM SUPPLY AIR OPENINGS 18 (457) ALTERNATE (THRU THE BASE) CONDENSATE DRAIN LOCATION 4-1/2 91-1/8 5-5/8 (143)

  • Page 7: Parts Arrangement

    LGX 180, 210, 240, 300 PARTS ARRANGEMENT REHEAT EVAPORATOR COIL FILTERS COIL (SIX - 24 X 24 X 2”) BLOWERS CONDENSER FANS (3 ON 180/210, 4 ON 240, ECONOMIZER 6 ON 300) DAMPERS (OPTIONAL) BLOWER MOTOR INDOOR COMPARTMENT RDS SENSOR (BEHIND EVAPORATOR COIL) UNIT CONTROLLER CONDENSER...

  • Page 8: Shipping And Packing List

    Turn off Check unit for shipping damage. Receiving party should gas and electrical power to unit before contact last carrier immediately if shipping damage is performing any maintenance or servicing found. operations on the unit. Follow lighting...
  • Page 9 Minimum R454B Space and CFM Requirements Minimum Airflow¹ Refrigerant Charge R-454B Unit (CFM) (m³h) Unit (lbs) (kg) LGX/LCX180 LGX/LCX180 3.04 LGX/LCX210 LGX/LCX210 3.54 LGX/LCX240 LGX/LCX240 3.31 LGX/LCX300 LGX/LCX300 2.68 ¹ NOTE - The minimum airflow is the lowest CFM allowed during venting operation (leak mitigation).

  • Page 10: Unit Support

    NOTICE IMPORTANT Roof Damage! The Clean Air Act of 1990 bans the intentional vent ing of refrigerant (CFC’s and HCFC’s) as of July 1, 1992. This system contains both refrigerant and oil. Some Approved methods of recovery, recycling or reclaiming rubber roofing material may absorb oil, causing the must be followed.

  • Page 11: Duct Connection

    5 - Units require support along all four sides of unit RIGGING base. Supports must be constructed of steel or suit- ably treated wood materials. NOTE - When installing a unit on a combustible surface for downflow discharge applications, an C1CURB14C roof mounting frame is required.

  • Page 12: Condensate Drain Connection

    CONDENSATE DRAIN CONNECTION OUTSIDE OF UNIT GAS PIPING TO GAS VALVE CAULK AROUND NOTE - Allow clearance to CONDENSATE open doors when installing COUPLING condensate piping. GROUND UNIT JOINT UNION Minimum Pitch MANUAL MAIN 1” (25 mm) per OPEN VENT SHUT-OFF VALVE 10' (3 m) of line MOUNTING...

  • Page 13: Pressure Test Gas Piping

    Pressure Test Gas Piping TABLE 1 HIGH ALTITUDE DERATE When pressure testing gas lines, the gas valve must Unit Altitude Ft.* Gas Manifold Pressure be disconnected and isolated. Gas valves can be damaged if subjected to more than 0.5 psig (3.48kPa). 2000-4500 2000-4500 See Unit Nameplate...

  • Page 14: Field Wire Routing

    FIELD WIRE ROUTING Electrical Connections - Control Wiring Connect either a thermostat, room/zone sensor, or direct digital controller; one of the three are required for unit function. Refer to the literature provided with each device and the following information. NOTE - Optional wireless sensors are available for use OPTIONAL SIDE ENTRY with this unit.
  • Page 15 FIELD WIRING IN ZONE SENSOR MODE FIELD WIRING WITH ELECTRONIC AND (Zone Sensor Mode) ELECTRO-MECHANICAL THERMOSTATS (Thermostat Mode) 24 V POWER UNIT CONTROLLER P297 J297 SENSOR 24VAC SENSOR INPUTS J298 A2 SENSOR FIGURE 9 FIGURE 8 2 - Zone Sensor Mode The Unit Controller will operate heating and cooling based on the Unit Controller internal setpoints and the temperature from the A2 zone sensor.

  • Page 16: Mobile Service App

    D-App Menus Mobile Service App See FIGURE 10 for the menu overview. Follow the app Setup and configure each rooftop unit using the mobile prompts in the Install, Network Integration, and Test and service app (Android or iOS devices supported). Balance menus.
  • Page 17 TEST AND BALANCE MENU NETWORK INTEGRATION MENU BLOWER TEST AND TEST AND BALANCE BALANCE NETWORK SETUP NETWORK DAMPER WIZARD INTEGRATION Partial menu shown. Complete all three menu paths and select “Finish” at the summary screen. FIGURE 13 FIGURE 12 E-Unit Controller Components See FIGURE 14 for Unit Controller components.
  • Page 18 TEST BUTTON tESt * Short press will put the unit into test mode * Long press will put the unit into setup mode StAt for two-stage thermostate - RESET BUTTON CLdL * Short press will clear unit delays (lockouts) * Long press will reset the M4 Unit Controller - * Short press is about 2 to 5 seconds in duration.

  • Page 19: Multi-Stage Air Volume Start-Up

    E-Set Damper Minimum Position Multi-Stage Air Volume Start-Up To maintain required minimum ventilation air volumes The blower rotation will always be correct on units when the unit is in the occupied mode, two minimum equipped with an inverter. Checking blower rotation is damper positions must be set.
  • Page 20 TABLE 5 HEATING, VENTILATION, & SMOKE MINIMUM AND MAXIMUM CFM Unit Heating CFM Vent CFM Smoke CFM Tons Model Speed Heat Code Default Min. Max. Default Min. Max. Default Min. Max. 4325 LGX180 4500 6000 7200 6000 2250 7200 6000 2250 7200 High...

  • Page 21: Blower Operation And Adjustments

    WARNING Blower Operation and Adjustments Supply Air Staged Units - The blower rotation will always 1- Make sure that unit is installed in accordance with the be correct on units equipped with an inverter. Checking installation instructions and applicable codes. blower rotation is not a valid method of determining 2- Inspect all electrical wiring, both field and factory- voltage phasing for incoming power.

  • Page 22: Blower Assembly

    TABLE 7 MINIMUM AND MAXIMUM PULLEY ADJUSTMENT Belt Min. Turns Open Max. Turns Open A Section No minimum B Section *No minimum number of turns open when B belt is used on pulleys 6” O.D. or larger. LOCATION OF STATIC PRESSURE READINGS INSTALLATIONS WITH DUCTWORK INSTALLATIONS WITH CEILING DIFFUSERS ROOFTOP UNIT...

  • Page 23: Pulley Alignment

    D-Blower Belt Adjustment MEASURE BELT TENSION Maximum life and wear can be obtained from belts only if proper pulley alignment and belt tension are maintained. Tension new belts after a 24-48 hour period of operation. This will allow belt to stretch and seat into pulley grooves. Make sure blower and motor pulley are aligned.
  • Page 24 LGX/LCX 180, 210, 240, 300 Page 24...

  • Page 25: Blower Data

    BLOWER DATA FACTORY INSTALLED BELT DRIVE KIT SPECIFICATIONS Nominal hp Maximum hp Drive Kit Number RPM Range 2.30 535 - 725 2.30 710 - 965 3.45 535 - 725 3.45 710 - 965 5.75 685 - 856 5.75 850 - 1045 5.75 945 - 1185 8.63...
  • Page 26 LGX/LCX 180, 210, 240, 300 Page 26...

  • Page 27: Refrigerant Leak Detection System

    3 - 180, 210, 240 - Refrigerant Leak Detection System Units contain three refrigerant circuits or systems. A-System Test See FIGURE 20. 1 - Initiate Refrigerant Leak Detection System Test by 300 - using the following mobile service app menu path: Units contain four refrigerant circuits or systems.
  • Page 28 • When transferring refrigerant into cylinders, ensure If weighing facilities are not available, or to check the that only appropriate refrigerant recovery cylinders charge, use the following procedure: are employed. Ensure that the correct number of 1 - Make sure outdoor coil is clean. Attach gauge cylinders for holding the total system charge is manifolds and operate unit at full CFM in available.
  • Page 29 180S, 210S UNITS - THREE REFRIGERANT CIRCUITS STAGE 1 CONDENSER EVAPORATOR COILS COIL STAGE 2 EVAPORATOR COIL STAGE 1 EVAPORATOR COIL STAGE 2 CONDENSER DRIERS (3) COILS FIGURE 20 240S - THREE REFRIGERANT CIRCUITS EVAPORATOR COIL STAGE 1 CONDENSER COILS STAGE 2 EVAPORATOR COIL...
  • Page 30 300 REFRIGERANT CIRCUITS ALL FOUR EVAPORATOR COIL CIRCUITS ARE INTERTWINED EVAPORATOR COIL (not to scale) CIRCUITS 1 & 2 CONDENSER COIL INTERTWINED CIRCUITS 3 & 4 CIRCUIT 1 & 2 CONDENSER COIL INTERTWINED CIRCUIT 3 & 4 FIGURE 22 LGX/LCX 180, 210, 240, 300 Page 30...
  • Page 31 D-Refrigerant Charge and Check - All Aluminum Coil E-Charge Confirmation and Fine Tuning - Liquid Temperature Check WARNING-Do not exceed nameplate charge under any condition. NOTE - Pressures are listed for sea level applications. This unit is factory charged and should require no further 1 - Use the same thermometer to accurately measure adjustment.
  • Page 32 TABLE 9 LGX/LCX 180 NO REHEAT NORMAL OPERATING PRESSURES - ALL-ALUMINUM COIL - 581137-02 Outdoor Coil Entering Air Temperature 65°F 75°F 85°F 95°F 105°F 115°F Suct Disc Suct Disc Suct Disc Suct Disc Suct Disc Suct Disc (psig) (psig) (psig) (psig) (psig) (psig)
  • Page 33 180 CHARGING CURVE CIRCUIT 2 - ALL-ALUMINUM COIL - 581136-02 CIRCUIT 2 Outdoor Temp (°F) Suction Press. (psig) 180 CHARGING CURVE CIRCUIT 3 - ALL-ALUMINUM COIL - 581136-02 CIRCUIT 3 Outdoor Temp (°F) Suction Press. (psig) Page 33 508515-01 7/2024...
  • Page 34 TABLE 10 LGX/LCX 210 NO REHEAT NORMAL OPERATING PRESSURES - ALL-ALUMINUM COIL - 581139-02 Outdoor Coil Entering Air Temperature 65°F 75°F 85°F 95°F 105°F 115°F Suct Disc Suct Disc Suct Disc Suct Disc Suct Disc Suct Disc (psig) (psig) (psig) (psig) (psig) (psig)
  • Page 35 210 CHARGING CURVE CIRCUIT 2 - ALL-ALUMINUM COIL - 581138-02 CIRCUIT 2 Outdoor Temp (°F) Suction Press. (psig) 210 CHARGING CURVE CIRCUIT 3 - ALL-ALUMINUM COIL - 581138-02 CIRCUIT 3 Outdoor Temp (°F) Suction Press. (psig) Page 35 508515-01 7/2024...
  • Page 36 TABLE 11 LGX/LCX 240 NO REHEAT NORMAL OPERATING PRESSURES - ALL-ALUMINUM COIL - 581141-02 Outdoor Coil Entering Air Temperature 65°F 75°F 85°F 95°F 105°F 115°F Suct Disc Suct Disc Suct Disc Suct Disc Suct Disc Suct Disc (psig) (psig) (psig) (psig) (psig) (psig)
  • Page 37 240 CHARGING CURVE CIRCUIT 2 - NO REHEAT - ALL-ALUMINUM COIL - 581140-02 CIRCUIT 2 Outdoor Temp (°F) Suction Press. (psig) 240 CHARGING CURVE CIRCUIT 3 - NO REHEAT - ALL-ALUMINUM COIL - 581140-02 CIRCUIT 3 Outdoor Temp (°F) Suction Press. (psig) Page 37 508515-01 7/2024...
  • Page 38 TABLE 12 LGX/LCX 300S NO REHEAT NORMAL OPERATING PRESSURES ALL - ALUMINUM COIL - 581143-02 Outdoor Coil Entering Air Temperature 65°F 75°F 85°F 95°F 105°F 115°F Suct Disc Suct Disc Suct Disc Suct Disc Suct Disc Suct Disc (psig) (psig) (psig) (psig) (psig)
  • Page 39 Circuit 2 - 581142-02 OD Temp (°F) Suction Press. (psig) CIRCUIT 3 OD Temp (°F) Suction Press. (psig) Page 39 508515-01 7/2024...
  • Page 40 CIRCUIT 4 OD Temp (°F) Suction Press. (psig) LGX/LCX 180, 210, 240, 300 Page 40...

  • Page 41: Prognostic Sensors

    F-Compressor Controls Prognostic Sensors See unit wiring diagram to determine which controls are Temperature thermistor sensors are located on specific used on each unit. Optional controls are identified on points for each refrigeration circuit. Temperature thermistors wiring diagrams by arrows at junction points. provide continuous temperature input to the unit controller 1 - High Pressure Switches (S4, S7, S28, S96) for proper cooling operation as well as system protection.
  • Page 42 LGX/LCX180, 210, 240 EVAPORATOR / INDOOR COIL RT46, 47, 50 22J06 RT50 CLAMP THERMISTOR TO BARE COPPER. DETAILS NOT TO SCALE 22J06 YELLOW RT46 22J06 BLUE RT47 FIGURE 23 LGX/LCX 180, 210, 240, 300 Page 42...
  • Page 43 LGX/LCX300 EVAPORATOR / INDOOR COIL RT46, 47, 50, 51 22J06 GREEN RT51 22J06 RT50 22J06 BLUE CLAMP THERMISTOR RT47 TO BARE COPPER. DETAILS NOT TO SCALE 22J06 YELLOW RT46 FIGURE 24 Page 43 508515-01 7/2024...

  • Page 44: Rds Sensors

    RDS Sensors TABLE 15 RDS Sensor Figures Units are equipped with factory-installed RDS Sensors Model Qty. Type Figure located on different points on the unit. The RDS sensors provide the Unit Controller with continuous readings for INDOOR SENSOR FIGURE 25 leaked refrigerant concentration levels and sensor health LCX/LGX 180-300 2 sensors...

  • Page 45: Gas Heat Start-Up (Gas Units)

    LCX/LGX 180-300 COMPRESSOR RDS SENSOR FIGURE 26 WARNING Gas Heat Start-Up (Gas Units) FOR YOUR SAFETY READ BEFORE LIGHTING Danger of explosion. Can cause injury or BEFORE LIGHTING smell all around the appliance area product or property damage. If overheating for gas.

  • Page 46: Heating Operation And Adjustments

    A-Placing Unit in Operation Turning Off Gas to Unit 1 - If using an electromechanical thermostat, set to the WARNING lowest setting. Danger of explosion and fire. Can cause 2 - Before performing any service, turn off all electrical injury or product or property damage. You power to the appliance.

  • Page 47: Sequence Of Operation

    LIMIT LOCATION Electric Heat Start-Up (LCX Units) Field-Installed Option DRIP Electric heat will stage on and cycle with thermostat SHIELD demand. Number of stages of electric heat will vary depending on electric heat assembly. See electric heat wiring diagram on unit for sequence of operation. LIMITS FIGURE 28 SEQUENCE OF OPERATION...
  • Page 48 SEQUENCE OF OPERATION MULTI-STAGE AIR VOLUME 180/210/240/300 MODELS (3 AND 4 COMPRESSORS) ZONE SENSOR SUPPLY AIR BLOWER SPEED Unit has following supply air blower speed setting: • Ventilation speed • Cooling Speed - Low • Cooling Speed - High • Heating Speed •...

  • Page 49: Zone Sensor

    SEQUENCE OF OPERATION MULTI-STAGE AIR VOLUME 180/210/240/300 MODELS (3 AND 4 COMPRESSORS) (CONTINUED) ZONE SENSOR Unit Does Not Feature An Economizer Or Outdoor Air Is Not Suitable 3 Compressor Units Y1 Demand: Compressor 1 operates and supply air blower operates at low cooling speed. Y2 Demand: Compressors 1 and 2 operate and supply air blower operates at low cooling speed.

  • Page 50: Preventative Maintenance / Repair

    – refrigerating pipe or components are installed in a Preventative Maintenance / Repair position where they are unlikely to be exposed to any IMPORTANT MAINTENANCE / REPAIR SAFETY substance which may corrode refrigerant containing INSTRUCTIONS components, unless the components are constructed of materials which are inherently resistant to being corroded Prior beginning...
  • Page 51 B-Lubrication BURNER BOX ASSEMBLY 480BTUH SHOWN All motors are lubricated at the factory. No further lubrication is required. VALVE BURNER ASSEMBLY Blower shaft bearings are prelubricated. For extended SECURED WITH bearing life, relubricate at least once every two years MULTIPLE SCREWS with a lithium base grease, such as Alvania 3 (Shell Oil), Chevron BRB2 (Standard Oil) or Regal AFB2 (Texas Oil).

  • Page 52: Top View

    IGNITOR AND SENSOR POSITION TOP VIEW Gas Flow Gas Flow 1-3/4” 1-3/8” (45mm) (35mm) 13/16” 3/8” (21mm) (10mm) BURNER BOX FIGURE 32 Under normal operating conditions, the combustion HEAT EXCHANGER ASSEMBLY air inducer wheel should be checked and cleaned prior to the heating season.
  • Page 53 4 - Reassemble the unit. The flue box cover gasket and combustion air inducer gasket should also be re- placed during reassembly. F-Evaporator Coil Inspect and clean coil at beginning of each cooling season. Clean using mild detergent or commercial coil cleaner. Flush coil and condensate drain with water taking care not to get insulation, filters and return air ducts wet.
  • Page 54 TABLE 17 - Unit MOP (Maximum Overcurrent Protection)** Model No. LCX180S Voltage - 60Hz 208/230V - 3 Ph 460V - 3 Ph 575V - 3 Ph Horsepower Model No. LCX210S Voltage - 60Hz 208/230V - 3 Ph 460V - 3 Ph 575V - 3 Ph Horsepower Model No.

  • Page 55: Adjusting Factory Unit Controller Settings

    Adusting Factory Unit Controller Settings Use the mobile service app to adjust parameters; menu paths are shown in each table. Refer to the Unit Controller manual provided with each unit. TABLE 20 shows factory settings (in degrees, % of fan CFM, etc.).

  • Page 56: Outdoor Air Cfm Control

    Configuration ID 1 1 2 3 4 5 6 7 8 [8] Outdoor Air CFM Humiditrol [1] Control Not Installed = N N = Not applicable (for future use) Humiditrol Installed = H L = Outdoor Air Control Installed Unconfigured = U with A24 Sensor set for low range.
  • Page 57 Configuration ID 2 1 2 3 4 5 6 7 8 9 10 Air Flow Proving [10] Reserved Switch (S52) N = Not Installed Not Installed = N [9] Electric Heat Installed on M4 = C (Field-Installed) Installed on DDC N = Not Installed Controller = D Y = Installed...

  • Page 58: Decommissioning

    f) Make sure that cylinder is situated on the scales before Decommissioning recovery takes place. Before carrying out this procedure, it is essential that g) Start the recovery machine and operate in accordance the technician is completely familiar with the equipment with instructions.

  • Page 59: Start-Up Report

    START-UP REPORT Job Name:___________________________________ Inspections and Checks Store No.___________Start-Up Date:______________ Damage? R454B If yes, reported to:____________________________ Address:_____________________________________ City:______________________________State:______ Verify factory and field-installed accessories. Start-Up Contractor:____________________________ Check electrical connections. Tighten if necessary. Technician:___________________________________ Supply voltage: L1-L2______L1-L3_____L2-L3_____ Model No.:___________________________________ If unit contains a 208-230/240 volt transformer: Serial No.:____________________________________ Check primary transformer tap Transformer secondary voltage: __________...

This manual is also suitable for:

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